Granted Patent
Utility
US 4,285,813 · App. 06/053,112
Aquarium filtration apparatus
Inventors:
James B. Stewart, Klaus Woltmann, Edwin E. Faris, Sheldon Schmidt
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jun 28, 1979
Inventors
James B. Stewart
Klaus Woltmann
Edwin E. Faris
Sheldon Schmidt
Assignee (at issue)
Metaframe, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.